Mine would be Dhaos, easily the best villain in the series. There's a lot I can say about the guy but let's keep it simple; he truly feels like a big bad, his boss fights are hard as hell and his battle themes are eargasmic. So who is your favorite character in any game from the Tales series?
Leon Magnus and Judas. I got pretty sad when he had a kind of "bad-end" in Tales of Destiny, but was overjoyed when I saw him returning for Tales of Destiny 2. I just wish the Destiny series got a happier ending though. Why do everyone has to be erased out of existence? (Leon and Judas included, of course.)
Even I feel its Dhaos. He is the best villain in the series. All characters are fun in the Tales series. But Dhaos is the best no doubt